2 questions about backlinks and web 2.0

Maybe you could find some blogs relevant to your site and comment on the posts, including your link. Or post some articles relevant to the topic of your site to relevant forum, including your link in the signature.

And all of them with high PR and targeted visitors.

Deep linking is great, it shows search engines that your site has good content. But I would keep links in your Web 2.0 down to 2-3 links.

Ya no problem, its always good to keep things reasonable, and more than 2 links does not help much either. Even having just 2 links just increases how fast it will get indexed. I usually only keep 1 or 2 anchors.

That's absolutely fine, just be sure to mix things up if you plan on building many web 2.0's. This is something I do, here's a few tips for you...

- Don't interlink the web 2.0's.
- Mix up the titles.
- Randomly link out to relevent authority sites from the web 2.0's.
- Use unique content on all web 2.0's (NOT SPUN).
- Randomly add relevent pics and youtube videos.
- Most of the web 2.0's will be blogs, make sure they don't all have 1 post.
- Don't always post 1, 2, 3 or 4 links to your site, mix it up! Sometimes 1 link, sometimes 2, you get the point.
- Don't post to nofollow web 2.0's, unless you enjoy losing the $3 you payed for the article. Get your nofollow's from bookmarking or something else.
- Don't build all the web 2.0's on the same day, spread it out.
- Submitt all web 2.0's that are on subdomains here to get them indexed super fast.
- CRITICAL - Backlink your web 2.0's with bookmarking and forum profiles.
- Remember link velocity, backlink your web 2.0's slowly over time.

That's all I can think of right now, hope it helps.

I think your confusing Web 2.0 properties with Article Directories, but yes you can. You just don't want to be using the same content for all those sites. Invest in a content spinning tool to quickly generate a new article with at least 30% uniqueness (preferably much higher).

You should be asking, "what seems more natural?" Would a normal person post that many links? If they did, would it be in that same structure?

You should work on minimizing any footprints and try and make your link building seem as natural as possible.

Yes, linking to inner pages is a good idea, just as varying up the anchor text is. Why would a site only get links to a single page?